Abstract
MgB2/Fe wires have been produced by the powder-in-tube technique following the in situ route. The influenceof low amounts of Cu or Ag additions into the precursor powder mixture on the kinetics ofMgB2 formation was studied in situ by means of synchrotron x-ray diffraction during heat-treatments at 504and 547 °C. Both Cu and Ag additions result in a significant increase of theMgB2 formation rate. Athin, discontinuous Fe2B layer was formed at the interface between theMgB2 core and the Fe sheath. At the end of the heat-treatment, Cu andAg were found in submicrometer-sized particles segregated within theMgB2 matrix.
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